[PATCH 0/9] nfs: add CB_NOTIFY_LOCK support to nfs client

[Jeff Layton <jlayton@redhat.com>]

This patchset adds support for CB_NOTIFY_LOCK callbacks to the NFS
client. The basic idea is to add a waitqueue to the nfs_client and then
have blocking lock waiters wait on that queue for callbacks.

When a callback comes in, we use a keyed wakeup to wake any waiters. The
waitqueue handling is necessarily more "manual" than I would like, but I
don't see a real alternative there given that we need to insert the
waiters onto the waitqueue prior to sending the lock request, and
sending a lock request can involve blocking operations.

Tested in conjunction with the corresponding knfsd server-side patchset.

Jeff Layton (9):
  nfs: the length argument to read_buf should be unsigned
  nfs: eliminate pointless and confusing do_vfs_lock wrappers
  nfs: check for POSIX lock capability on server even for flock locks
  nfs: add a freezable_schedule_timeout_unsafe() and use it when waiting
    to retry LOCK
  nfs: add handling for CB_NOTIFY_LOCK in client
  nfs: move nfs4_set_lock_state call into caller
  nfs: add code to allow client to wait on lock callbacks
  nfs: ensure that the filehandle in CB_NOTIFY_LOCK request matches the
    inode
  nfs: track whether server sets MAY_NOTIFY_LOCK flag

 fs/nfs/callback.h         |   8 ++++
 fs/nfs/callback_proc.c    |  20 ++++++++
 fs/nfs/callback_xdr.c     |  51 +++++++++++++++++++-
 fs/nfs/file.c             |   9 +---
 fs/nfs/nfs4_fs.h          |   1 +
 fs/nfs/nfs4client.c       |   1 +
 fs/nfs/nfs4proc.c         | 118 +++++++++++++++++++++++++++++++++++++---------
 include/linux/freezer.h   |  13 +++++
 include/linux/nfs_fs_sb.h |   1 +
 9 files changed, 190 insertions(+), 32 deletions(-)

-- 
2.7.4